Bug #4196: Array#flatten!(0) should return nil
http://redmine.ruby-lang.org/issues/show/4196

Author: Daniel Berger
Status: Open, Priority: Normal
Category: core, Target version: Ruby 1.8.7
ruby -v: ruby 1.8.7 (2010-08-16 patchlevel 302) [i686-darwin10.4.0]

Since Array#flatten!(0) does not modify the array I believe it should return nil. At the moment, in 1.8.7-p302, it returns itself.

irb(main):001:0> [1,[2,3,[4,5]]].flatten!(0)
=> [1, [2, 3, [4, 5]]]

Note that JRuby 1.5.6 returns nil for the above code, so either MRI is wrong or JRuby is wrong.


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